ProgramNode(0...11)(
  [],
  StatementsNode(0...11)(
    [CallNode(0...11)(
       nil,
       nil,
       (0...3),
       (3...4),
       ArgumentsNode(4...10)(
         [KeywordHashNode(4...10)(
            [AssocNode(4...6)(
               SymbolNode(4...6)(nil, (4...5), (5...6), "a"),
               nil,
               nil
             ),
             AssocNode(8...10)(
               SymbolNode(8...10)(nil, (8...9), (9...10), "b"),
               nil,
               nil
             )]
          )]
       ),
       (10...11),
       nil,
       0,
       "foo"
     )]
  )
)
